GTTF: convert some tests in chrome to use EmbeddedTestServer patch nr 1

chrome/test/data/extensions/api_test/proxy/events/invalid_proxy.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // proxy api test
 // browser_tests.exe --gtest_filter=ProxySettingsApiTest.ProxyEventsInvalidProxy
 
 var expected_error = {
     error: "net::ERR_PROXY_CONNECTION_FAILED",
     details: "",
     fatal: true
 };
 var empty_json_url = "";
 
 function test() {
   // Install error handler and get the test server config.
   chrome.proxy.onProxyError.addListener(function (error) {
     chrome.test.assertEq(expected_error, error);
     chrome.test.notifyPass();
   });
   chrome.test.getConfig(readConfigAndSetProxy);
 }
 
 function readConfigAndSetProxy(test_config) {
   // Construct the URL used for XHRs and set the proxy settings.
   empty_json_url = "http://127.0.0.1:" +
       test_config.testServer.port +
-      "/files/extensions/api_test/proxy/events/empty.json";
+      "/extensions/api_test/proxy/events/empty.json";
 
   // Set an invalid proxy and fire of a XHR. This should trigger proxy errors.
   // There may be any number of proxy errors, as systems like safe browsing
   // might start network traffic as well.
   var rules = {
     singleProxy: { host: "does.not.exist" }
   };
   var config = { rules: rules, mode: "fixed_servers" };
   chrome.proxy.settings.set({'value': config}, sendFailingXHR);
 }
 
 function sendFailingXHR() {
   var req = new XMLHttpRequest();
   req.open("GET", empty_json_url, true);
   req.onload = function () {
     chrome.test.notifyFail("proxy settings should not work");
   }
   req.onerror = testDone;
   req.send(null);
 }
 
 function testDone() {
  // Do nothing. The test success/failure is decided in the event handler.
 }
 
 test();